Microstructure and Mechanical Property of a Directional Ni-based Superalloy during Long-term Exposure

Directional Ni-based superalloy DZ483 is an advanced gas turbine blade material for heavy duty gas turbine application, which has good combination properties. The major research of this paper is studied on DZ483 alloy's microstructural changes and mechanical property during long-term exposures in service environments. The results showed that: During thermal processing, the size and distribution of gamma' phase tends to be more homogeneous in the interdendritic spaces; the gamma' phase on the dendrite seem to arrange in designated directions. During long-term exposures, the amount of the gamma' phase was decreasing and the foursquare gamma' phases gradually became abnormal with the increasing temperature. However, tensile properties of DZ483 have not decreased obviously.